Workholder for grinding machines



April 15, 1930.

E. F. LONGENBACK 1,754,898

WORKHOLDER FOR GRINDING MACHINES 2 Sheets-Sheet 1 Filed Aug. 25, 1926' E. F. LONGENBACK WO RKHOLDER FOR GRINDING MACHINES April 15, .1930.

Filed Aug. 25. 1926 2 Sheets-Sheet 2 mw fl- NW 10.5.... d W n n m? g r. fl m O m M m WW I ml l l 1 H. U f mm, in: NM n .u. kw N %M\ Patented Apr. 15, 1930 UNITED STATES PATENT OFFICE EDWIN IF. LONGENIBACK, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO AMERICAN MANGANESE STEEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE WORKHOLDER FOR GRINDING MACHINES Application filed August 25, 1926. Serial No. 131,327.

My invention relates to improvements in work holders for grinding machines, and more especially a holder which is particularly serviceable when applied to the type of m machine employed for grinding keyways and the 1like, and articles made of manganese stee It, is Well known that manganese steel is machined with such difliculty that it is usual m to make articles by the art of casting and to finish any surfaces of the casting by. grindingrather than by the use of a shapingmachine cutter.

It is the purpose of my invention to pro- M; vide a work holding means to be used in conjunction with such a machine and of a type that will greatly facilitate the'grinding process and will largely overcome the difficulties encountered heretofore.

It is the further aim provide a wo k holding means which is capable of pivo a1 movement so that it may be swung into a position to facilitate the application of work thereto; and into a second poa sition in which the work is maintained in a position tobe properly engaged by the grinding tool.

it is the further aim of my invention to provide a work holding means which is pivae otally mounted so that it will be made to asat of my invention to sume a substantially horizontal position in which the work piece may be mounted with facility and accuracy, or a position in a substantially vertical plane, or a plane substantially perpendicular to the line of movement of the grinder, that is, to form the keyway, for instance; or at such angle of deviation from erperidicularity aswill give to the keyway t e drift or taper required to cause the key to wedge therein; such positions being at the extremities of the swing of the holder determined by its being engaged by adjustable limiting stops, the regulation of which assures its desired disposition in the two planes.

Further, I have provided in my invention a holding means for the work piece'which is to be used in conjunction with a grinding machine having a tool that advances along the horizontal plane, the holder by engagetil tive position to head power shaft,

ment with adjustable stop means being capable of maintaining a position which is at right angles to the advance of the grinding tool, and in this manner accurately effect the desired grinding process.

It is the further object of my invention to provide a work holding means which is pivotally mounted on a supporting element, which supporting element is capable of adjustment in two planes so that the work holder as a whole may be moved in any relathe grinding tool to effect proper engagement depending upon the nature and size of the work piece.

My invention will be more fully understood from the following detail description of a preferred embodiment when considered in connection with ing in which like reference numerals represent corresponding parts.

In the drawings- Figure 1 represents a side elevation of the grinding machine and holder therefor, showing the holder mounted on a separate base but positioned so as to hold the work piece in a proper position to be engaged by the grinding tool;

Figure 2 is an end elevation of the holding means as seen from the left hand side of Figure l; and

Figure 3 is an enlarged view in cross-section of the holding means showing the grinding tool inworking position.

10 represents a base and support for a grinding machine which has a reciprocating carriage 11 slidably mounted on its top side. The carriage 11 is driven by belt 12 and pulley wheel 13, which derives its power from any desirable source, such as an oversuggested, but not shown, in Figure 1. Mounted on the carriage 11 is the motor 14 and the grinding wheel 15, which is 'driven therefrom by means of the belts 16 and ll'. The belt 17 enga es the motor pulley and a small pulley on t e countershaft 18, which shaft also has mounted thereon a pulley of large diameter adapted to receive the belt 16, this arrangement eifecting a high speed drive for the grinding wheel.

19 is a supporting base for the holding the accompanying draw- 1 means which is positioned adjacent the grinding machine and preferably mounted to slide on runners, as shown at 20. Positioned above and supported by the base is block 21 having a dovetail horizontal groove 22 in one vertical face, which is adapted to receive a tongue 23 of a sliding supporting block 24 in a manner to permit a lateral ad justment of the last named block by manip ulating the hand wheel 25. On the opposite face of the block 24 is provideda dovetail groove 26 similar to the groove 22, but disposed at 90 to the tongue 23 on its opposite side. The purpose of groove 26 is to receive in a sliding manner the tongue 27 which extends vertically on one face of the sliding carriage 28, which carriage is provided at its top with suitable bearings for the trunnion 29, the trunnion forming a pivotal support for the work holder designated generally at 30. The work holder consists of a main body portion 31 provided with a bearing for the trunnion 29, and the slotted head 32 of a design suitable to receive and hold the work pieces.

33 are bolts mounted on the outer face of the head 32 which form together with the clamping plate 34, means for centering and holding the work piece in proper relation to the head 32. Bolts 33 are provided with heads slidable in slots 35 so that they may be positioned in a radial line any desirable distance from the center of the head. The holding means is further provided with shoulders 36 and 37 which are adapted to engage the limiting stops 38 and 39, respectively. which are shown as screws in the preferred form. The adjusting stop 39 can be mounted on any suitable supporting arm. such as shown at 40 for instance, any diiference in elevation of the trunnion 29 effected by adjustment of the holder being compensated for by corresponding adjustment to the stop screw 39 so as to maintain the head 32 in a horizontal position for all adjustments.

In operation, when it is desired to apply a particular piece of Work to the grinding machine, the head 30 is swung to the left. as shown in Figure 1, so as to assume a horizontal position. In this position the head 32 is similar to a working table and in view of the fact that it is removed from the other parts of the machine, it is rendered quite easy to apply the work thereto. It is an important feature to have the work properly aligned with the center of the head 32. this being very difiicult to accomplish when the head is vertically disposed but which is quite simple when the head assumes a horizontal position. The bolts 33 and the clamp 34 are applied when the work is properly positioned, the head then being swung to the right so as to assume avertical position, and to present the work so as to be engaged by the grinding element, this last position being shown in Figure 3.

Depending upon the type of work piece that is being machined, (shown as a beveled gear in the drawing), the proper adjustment is made by movement of the slide blocks 24 and 28 so as to position the work piece properly relative to the line of advance of the grinding wheel 15. The grinding wheel 15 is mounted to move with the slide carriage ll and consequently, it assumes a definite straight line movement. This fact is important because by the movement of the adjusting stops 38, the plane of the head 32 and consequently the work piece may be made to assume a position of 90 to the line of advance of the carriage movement.

For grinding articles of similar size and type. the adjustment may be made to effect the proper alignment for the first piece and thereafter no further adjustment need be made as the proper centering of the work.

piece on the table 32, which is usually done when the table is in a horizontal position, is the only necessary operation to cause all the work pieces to assume a proper position relative to the path of the advance of the grinding tool. The adjustment of the block 24 is accomplished by the hand wheel 25 and is effected in any desired manner, one method being shown employing a screw fixed to turn with the hand wheel and to engage threads in the bore of the block. Vertical movement of the block 28 is accomplished by rotation of the spindle 41, Figure 2, which operates mechanism well known in this art, but not shown, for imparting up and down movement to the block 28.

It is to be understood that the present disclosure is only a preferred embodiment of my invention and that it is my intention to include all forms that fall within the scope of the appended claims.

1 claim:

.1. In a device of the character described, a

tool mounted for advancement in a path of predetermined direction in a horizontal plane, in combination with a work holder for positioning and maintaining a work piece in predetermined relationship within and to the path of said tool. said work holder having a plane surface adapted to receive a work piece thereagainst and means for holding said work piece against said plane surface, formed to cause said plane surface to determine the position of the work piece, means for mountingsaid work holder for vertical and transverse adj ustments, and pivotal means connecting said work holder to said last named-moans. and adjustable stop means limiting the pivotal movement of said work holder for maintaining said work holder with said plane surfacein substantially a horizontal plane in one extreme position and maintaining said work holder with said plane the other extreme position, said work holder lar to said path of when in substantially vertical position presenting the work piece in the path of said tool.

2. A grinding machine having in combina- .tion a grinding tool mounted for advancement in a path of predetermined direction in a horizontal plane, with a work holder, said work holder comprising a stand mounted for vertical and transverse adjustments, and a work piece table pivotally' mounted on said stand on an axis extendingperpendicularly to said path of predetermined direction and in a horizontal plane and having a plane surface parallel to said axis, said plane surface being adapted to receive a work piece thereagainst and having means for holding said work piece against said plane surface formed to cause said plane surface to determine the plane of one surface of the work piece, and adjustable abutment stops for maintaining said work holder with said plane surface in substantially a horizontal plane in one extreme position and maintaining said work holder with its plane surface in substantially a verticalplane in the other extreme position.

3. A machine for grinding work pieces in a direction perpendicular to a particular sur face thereof, having in combination, a grinding tool mounted for advancement in a path of a predetermined direction in a horizontal plane, with a work piece holder, comprising a stand mounted for vertical and transverse movement, and a work piece table pivotally mounted on said stand on an axis perpendicupredetermined direction and in a horizontal plane, and havin a lane surface parallel to said axis, means for olding a work piece against said plane surface constructed to cause a particular surface thereof to coincide with said plane surface, and adjustable stop means for limiting the pivotal movement of said work piece table, and to maintain said work piece table with its plane face in substantially a horizontal plane in one extreme position of movement, and to maintain said'work piece table with its plane face in substantially a vertical plane in the other extreme position of movement andhin predetermined relationship to said pat '4. A machine for grinding axial keyways and the like in gears and the like, having in but with. freedom of position in said plane, and adjustable abutment stops for maintaining said work table with its plane surface in su stantially a horizontal plane in one extreme position and for maintaining said work ta le in a position with its plane surface in substantially avertical plane in the other extreme position of movement and with the work after adjustment of said stand in proper grinding relationship to the advancm grinding tool.

igned at Chicago Heights, Illinois, this 12th day of August, 1926.

EDWINF; LONGEN BACK.

combination a grinding tool adapted to ad vance in a predetermined straight horizontal path, with work holder, said work holder comprising a stand mounted for transverse and vertical adjustments, and a work table having a plane surface, pivotally mounted on said stand on an axis perpendicular to said path and in a horizontal plane, means for holding a gear or the like, against said plane surface with a particular surface of the gear or the like, in the plane of said plane surface 

